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Parametric studies on radiation grafting of polymeric sorbents for recovery of heavy metals from seawater / T. L. Prasad in Industrial & engineering chemistry research, Vol. 49 N° 14 (Juillet 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6559–6565 Titre : Parametric studies on radiation grafting of polymeric sorbents for recovery of heavy metals from seawater Type de document : texte imprimé Auteurs : T. L. Prasad, Auteur ; P. K. Tewari, Auteur ; D. Sathiyamoorthy, Auteur Année de publication : 2010 Article en page(s) : pp. 6559–6565 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Radiation  grafting  polymeric Résumé : Uranium and vanadium are valuable trace metals in seawater. The economic viability of recovery of these metals depends on development of efficient sorbents. The radiation induced graft polymerization technique was adopted in this study to prepare metal chelate embedded polymers in sheet form in order to investigate the recovery the heavy metals from seawater, using different nonwoven substrate materials. In order to obtain more direct information on the grafting levels, the parametric studies to see the influence of cumulative dose, retention time in air, surrounding atmosphere, and reaction temperature on grafting yields were investigated using different electron beam energies. The grafted sorbents were verified by infrared spectroscopic measurements, and thermal properties were analyzed by scanning calorimetric methods. Metal sorption characteristics for uranium and vanadium were evaluated through in-field trials at seawaters of the Andaman and Nicobar Islands, Indian Ocean, and Arabian Sea along Indian coastal lines. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100326q [article] Parametric studies on radiation grafting of polymeric sorbents for recovery of heavy metals from seawater [texte imprimé] / T. L. Prasad, Auteur ; P. K. Tewari, Auteur ; D. Sathiyamoorthy, Auteur . - 2010 . - pp. 6559–6565. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 14 (Juillet 2010) . - pp. 6559–6565 Mots-clés : Radiation  grafting  polymeric Résumé : Uranium and vanadium are valuable trace metals in seawater. The economic viability of recovery of these metals depends on development of efficient sorbents. The radiation induced graft polymerization technique was adopted in this study to prepare metal chelate embedded polymers in sheet form in order to investigate the recovery the heavy metals from seawater, using different nonwoven substrate materials. In order to obtain more direct information on the grafting levels, the parametric studies to see the influence of cumulative dose, retention time in air, surrounding atmosphere, and reaction temperature on grafting yields were investigated using different electron beam energies. The grafted sorbents were verified by infrared spectroscopic measurements, and thermal properties were analyzed by scanning calorimetric methods. Metal sorption characteristics for uranium and vanadium were evaluated through in-field trials at seawaters of the Andaman and Nicobar Islands, Indian Ocean, and Arabian Sea along Indian coastal lines. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie100326q

Thermal denitration of ammonium nitrate solution in a fluidized - bed reactor / Sandip Bhowmick in Industrial & engineering chemistry research, Vol. 51 N° 25 (Juin 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8394–8403 Titre : Thermal denitration of ammonium nitrate solution in a fluidized - bed reactor Type de document : texte imprimé Auteurs : Sandip Bhowmick, Auteur ; Hanmanth Rao, Auteur ; D. Sathiyamoorthy, Auteur Année de publication : 2012 Article en page(s) : pp. 8394–8403 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Ammonium  Nitrate  Fluidized  bed Résumé : Ammonium diuranate (ADU) filtrate, which contains mainly ammonium nitrate (80–100 g/L), is generated during hydrometallurgical processing of uranium. This filtrate stream poses a disposal problem because of its high nitrate content and residual radioactivity. Fluidized-bed thermal denitration is considered as a suitable chemical-free disposal option for the aqueous waste nitrate stream. Hence, investigations to explore the decomposition of ammonium nitrate in a fluidized bed have been carried out. To enable theoretical analysis and performance evaluation of the process, a mathematical model was developed. The model is based on two-phase theory of a bubbling fluidized bed. Model calculations were used to predict the axial concentration profile of ammonium nitrate in the emulsion and bubble phases and the axial temperature profiles of gas bubbles, emulsion gas, and emulsion particles. The mechanism of decomposition of ammonium nitrate in a fluidized bed was explored, and the conversion of ammonium nitrate was estimated. Model predictions were compared with experimental data available from a bench-scale plant. Good agreement was obtained between the model predictions and the experimental measurements. A steady-state parametric study indicated that conversion is enhanced with an increase in bed temperature and feed concentration. It was found that operation at higher feed concentration leads to local hot spots. The required reaction-zone length for complete conversion of ammonium nitrate vapor in the emulsion phase was found to decrease significantly with increased bed temperature. No marked effect of u/umf on conversion was observed. Optimum values of process parameters to maximize the conversion were derived. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202018t [article] Thermal denitration of ammonium nitrate solution in a fluidized - bed reactor [texte imprimé] / Sandip Bhowmick, Auteur ; Hanmanth Rao, Auteur ; D. Sathiyamoorthy, Auteur . - 2012 . - pp. 8394–8403. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 25 (Juin 2012) . - pp. 8394–8403 Mots-clés : Ammonium  Nitrate  Fluidized  bed Résumé : Ammonium diuranate (ADU) filtrate, which contains mainly ammonium nitrate (80–100 g/L), is generated during hydrometallurgical processing of uranium. This filtrate stream poses a disposal problem because of its high nitrate content and residual radioactivity. Fluidized-bed thermal denitration is considered as a suitable chemical-free disposal option for the aqueous waste nitrate stream. Hence, investigations to explore the decomposition of ammonium nitrate in a fluidized bed have been carried out. To enable theoretical analysis and performance evaluation of the process, a mathematical model was developed. The model is based on two-phase theory of a bubbling fluidized bed. Model calculations were used to predict the axial concentration profile of ammonium nitrate in the emulsion and bubble phases and the axial temperature profiles of gas bubbles, emulsion gas, and emulsion particles. The mechanism of decomposition of ammonium nitrate in a fluidized bed was explored, and the conversion of ammonium nitrate was estimated. Model predictions were compared with experimental data available from a bench-scale plant. Good agreement was obtained between the model predictions and the experimental measurements. A steady-state parametric study indicated that conversion is enhanced with an increase in bed temperature and feed concentration. It was found that operation at higher feed concentration leads to local hot spots. The required reaction-zone length for complete conversion of ammonium nitrate vapor in the emulsion phase was found to decrease significantly with increased bed temperature. No marked effect of u/umf on conversion was observed. Optimum values of process parameters to maximize the conversion were derived. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie202018t